public void SubtractImages()
{
Image <Bgr, Byte> Frame = null; //current Frame from camera
Image <Gray, float> Gray_Frame; //gray_frame form camera
Image <Gray, float> Background = null; //Average Background being formed
Image <Gray, float> Previous_Frame; //Previiousframe aquired
Image <Gray, float> Difference; //Difference between the two fra
double alpha = 0.003; //stores alpha for thread access
int Threshold = 60; //stores threshold for thread access
using (var _capture = new Capture())
{
if (Frame == null) //we need at least one fram to work out running average so acquire one before doing anything
{
//display the frame aquired
Frame = _capture.RetrieveBgrFrame(); //we could use RetrieveGrayFrame if we didn't care about displaying colour image
//DisplayImage(Frame.ToBitmap(), captureBox); //display the image using thread safe call
//copy the frame to previousframe
//Previous_Frame = Frame.Convert<Gray, Byte>().Convert<Gray, float>(); //we can only convert one aspect at a time so wel call convert twice
Background = Frame.Convert <Gray, Byte>().Convert <Gray, float>(); //we can only convert one aspect at a time so wel call convert twice
}
//acquire the frame
Frame = _capture.RetrieveBgrFrame(); //we could use RetrieveGrayFrame if we didn't care about displaying colour image
//DisplayImage(Frame.ToBitmap(), captureBox); //display the image using thread safe call
//create a gray copy for processing
Gray_Frame = Frame.Convert <Gray, Byte>().Convert <Gray, float>(); //we can only convert one aspect at a time so wel call convert twice
//cvAbsDiff(pFrameMat, pBkMat, pFrMat);
Difference = Background.AbsDiff(Gray_Frame); //find the absolute difference
Difference.ToBitmap().Save("C:\\test_Difference.jpg");
//CvInvoke.cvRunningAvg(Difference, Background, 0.003, Background);
/*Play with the alpha weighting 0.001 */
Background.RunningAvg(Difference, alpha); //performe the cvRunningAvg frame acumullation
//DisplayImage(Background.ToBitmap(), resultbox); //display the image using thread safe call
Background.ToBitmap().Save("C:\\test_Background.jpg");
}
}
